Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Compounds of the alkali metals
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Describe what you would observe if a freshly cut piece of potassium is left exposed to air. Explain why this observation occurs.
Question 2
5 marks · Hard
Answer and see the solution →The table lists several Group 1 metal compounds:
(a)[3 marks]Compound Colour Solubility in water Lithium nitrate ? ? Sodium sulfate ? ? Potassium carbonate ? ? Complete the table by stating the usual colour and solubility in water of each compound.
(b)[2 marks]Explain why most compounds of lithium, sodium, and potassium dissolve to form colourless solutions.
Question 3
2 marks · Hard
Answer and see the solution →Explain why alkali metals must be stored under oil, using what happens when they are left uncovered in air.